hiya,just done head gasket and its running like a sack of sxxt .it pulses when running the rpm goes between 800 and 2000 rpm > .am i going potty? > .it seams to run on 3 cylinders no 4 doesnt seam to do bugger all .all put back together as per the daihatsu manual.anyhelp would be gratefully received.cheers not so sportyjay